En
gl
is
h (
G
B)
30
Delay
The "
Delay
" parameter is used to define the time
period until an error message is generated: "
short
",
"
medium
" or "
long
". The delay depends on the set
dosing flow and therefore cannot be measured in
strokes or time.
Air bubbles
The "
FlowControl
" function identifies air bubbles
> 60 % of the stroke volume. After switching to
"Air bubble" warning status, the pump adapts the
stroke frequency to approximately 30-40 % of max.
stroke frequency, and starts a special motor drive
strategy. The adaptation of the stroke frequency
allows the air bubbles to rise from suction to
discharge valve. Due to the special motor drive
strategy the air bubbles are displaced from the
dosing head into the discharge line.
If the air bubbles have not been eliminated after a
maximum of 60 strokes, the pump returns to the
normal motor drive strategy.
6.8
Pressure monitoring
Applies to DDA-FC/FCM control variant.
A pressure sensor monitors the pressure in the
dosing head. If the pressure during the discharge
phase falls below 2 bar, a warning is generated
(pump continues running). If in the "
Setup
>
Pressure monitoring
" menu the function "
Min.
pressure alarm
" is activated, an alarm is generated
and the pump is stopped.
If the pressure exceeds the "
Max. pressure
" set in
the "
Setup
>
Pressure monitoring
" menu, the pump
is shut down, enters the standby state and indicates
an alarm.
6.8.1 Pressure setting ranges
6.8.2 Calibration of pressure sensor
The pressure sensor is calibrated in the factory. As a
rule, it does not need to be re-calibrated. If specific
circumstances (e.g. pressure sensor exchange,
extreme air pressure values at the location of the
pump) necessitate a calibration, the sensor can be
calibrated as follows:
1. Set pump to "Stop" operating state.
2. Make system pressureless and flush.
3. Dismantle suction line and suction valve.
4. Proceed as described below to calibrate:
If a calibration is not successfully possible, check
plug connections, cable and sensor and replace
defective parts where necessary.
Caution
The pump restarts automatically once
the backpressure falls below the set
"
Max. pressure
"!
Type
Fixed min.
pressure [bar]
Adjustable max.
pressure [bar]
DDA 7.5-16
< 2
3-17
DDA 12-10
< 2
3-11
DDA 17-7
< 2
3-8
DDA 30-4
< 2
3-5
Warning
Install a pressure-relief valve in the
pressure line to provide protection
against impermissibly high pressure!
Caution
The pressure measured in the dosing
head is slightly higher than the actual
system pressure.
Therefore the "
Max. pressure
" should
be set at least 0.5 bar higher than the
system pressure.
Warning
Calibrating when the suction valve is
installed produces incorrect calibration
and can cause personal injuries and
damage to property!
Only carry out a calibration if this is
technically required!
T
M
0
4
1
1
45
25
10
Prompt:
"
Activate FlowContr.?
"
FlowControl not
activated
FlowControl active,
Sensor not calibrated.
Prompt:
"
Sensor calibration?
"
Prompt:
"
Suction valve
removed?
"
Sensor not calibrated.
OK
Calibration error
Message:
"
Sensor calib. OK!
"
"
Current pressure:
X
bar"
Message:
"
Sensor calib. failed!
"
"
Repeat?
"
Sensor not calibrated.
Plug in pressure sensor plug or select "
Setup
>
FlowControl active
" menu
